Clamping device

ABSTRACT

A clamping device is provided for a brake rigging having spaced brake hangers separated by a brake head. A pin is located in a passage in the brake hangers and brake head and is used as a pivotal point to provide movement between the head and the hangers. A hexagonal shaped nut is threaded on to one end of the pin and is engaged in a hexagonal shaped opening in one of the brake hangers. The shape of the nut and the opening is such that the nut may not be rotated within the opening. The other end of the pin has an asymmetrical portion which projects outwardly from the other brake hanger. A first washer is engaged with the asymmetrical portion and has a hexagonal shape outer surface engaged within a hexagonal shaped opening in the hanger. The washer-pin-opening arrangement is such that the washer may not be rotated relative to the pin or the opening. A compression spring encircles the asymmetrical portion of the pin. A second washer engages the outer portion of the compression spring and is used, in combination with a nut, to force the first washer into the hexagonal shaped opening and hold the pin relative to the brake hangers.

iUnite States atent Kraus, Jr.

[ 1March 2Q, 1973 CLAMPING DEVICE [75] Inventor: Michael Henry Kraus,Jr., Hammond, Ind.

[73] Assignee: Amsted Industries Incorporated,

Chicago, Ill.

[22] Filed: May 19, 1971 [21] Appl. No.: 144,768

[52] US. Cl. ..188/206 R, 188/209 [51] Int. Cl ..F16d 65/06 [58] Fieldof Search....l88/206 R, 209; 287/100, 101

[56] References Cited UNITED STATES PATENTS 1,199,869 10/1916 Burton..l88/206 R 2,509,285 5/1950 Bendicsen 2,725,124 l l/l955 Holin..l88/206 R Primary Examiner-Duane A. Reger Attorney-Walter L. Schlegel,Jr. and John W. Yakimow ABSIRACT A clamping device is provided for abrake rigging having spaced brake hangers separated by a brake head. Apin is located in a passage in the brake hangers and brake head and isused as a pivotal point to provide movement between the head and thehangers. A hexagonal shaped nut is threaded on to one end of the pin andis engaged in a hexagonal shaped opening in one of the brake hangers.The shape of the nut and the opening is such that the nut may not berotated within the opening. Theother end of the pin has an asymmetricalportion which projects outwardly from the other brake hanger. A firstwasher is engaged with the asymmetrical portion and has a hexagonalshape outer surface engaged within a hexagonal shaped opening in thehanger. The washer-pin-opening arrangement is such that the washer maynot be rotated relative to the pin or the opening. A compression springencircles the asymmetrical portion of the pin. A second washer engagesthe outer portion of the compression spring and is used, in combinationwith a nut, to force the first washer into the hexagonal shaped openingand hold the pin relative to the brake hangers.

4 Claims, 4 Drawing Figures CLAMPING DEVICE BACKGROUND OF THE INVENTIONFor years brake heads have been retained between brake hangers by a pinpassing through openings in each of the members. One end of the pin isin threaded engagement with a nut while the head of the pin is engagedin a hexagonal shaped opening in one of the brake hangers. Thisarrangement has been found to be satisfactory in some applications butdoes create substantial problems in applications where clearance islimited on one side of the brake assembly. In limited clearancearrangements, it is extremely difficult to remove the pin from theopening in order to replace worn brake heads and pins.

BRIEF DESCRIPTION OF THE INVENTION This patent discloses a device whichprovides clamping force between mating parts, restricts rotation of theclamping pin after assembly and provides an area for wrench engagementin order that the pin may be readily threaded into parts of or removedfrom the assembly. These results are accomplished by providing acylindrical pin which may be engaged with cylindrical openings in thebrake hangers and the brake head. One end of the pin is in threadedengagement with a hexagonal shaped nut which is engaged in a hexagonalshaped opening. The nut may not be rotated relative to the opening. Theother end of the pin has an asymmetric portion in engagement with awasher having a hexagonal shaped outer portion. The outer portion of thewasher is engaged in a hexagonal shaped opening located in thecorresponding brake hanger. The washer may not be rotated relative tothe asymmetric portion of the pin or the opening. A spring is used toforce the washer against a shoulder in the opening and retain ittherein. The spring is compressed by means of a nut in threadedengagement with an outboard end of the pin. It may readily be seen thatthe hexagonal shaped nut in the opening may not be rotated relative tothe opening and that the washer on the opposite end of the pin preventsrotation of the pin relative to the opposed opening. These two openingsmay be formed within ferrules pressed onto the opposed brake hangers orif desired may be formed within the brake hangers themselves. In such away, the pin may be removed from the assembly by removing the nutoutboard from the asymmetric portion and then either pushing the pin andnut through the assembly or threadedly disengaging the pin from thehexagonal shaped nut in the hexagonal shaped opening and thenwithdrawing the pin from either direction from the assembly.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side elevational view of abrake head as- DETAILED DESCRIPTION OF THE DRAWINGS FIG. 1 is a sideview of a known brake rigging l0 having a brake head 12 pivotallyconnected to opposed brake hangers l4 and 16 by a pin 17. A live lever18 islocated intermediate side portions 19 of brake head 12 on pin 17.The upper portions of brake hangers l4 and 16 are pivotally secured to aknown railway truck by pins (not shown). The upper portion of live lever18 is connected to a known pneumatic cylinder (not shown) and is movedto engage brake head 12 with a railway wheel (not shown) in a knownmanner.

As illustrated in FIG. 2, outer ferrules 20 and 22 are in pressfitengagement with the brake hangers l4 and 16. Inner ferrules 24 and 26are engaged with bushings 28 and 30, located in side portions 19 ofbrake head 12. Another bushing 32 is engaged within live lever 18. Theouter ferrules 20 and 22 together with the inner ferrules 24 and 26 andbushing 32 define a cylindrical opening 33 through brake rigging 10.

One end of pin 17 is in threaded engagement with a hexagonal shaped nut34. The hexagonal outer portion of nut 34 is located within a hexagonalindentation 36 in outer ferrule 22. The indentation 36 prevents movementof hexagonal shaped nut 34 relative to outer ferrule 22.

The opposite end of pin 17 has an asymmetric portion 38 defined by flatsurfaces 40 and 42 and opposed arcuate surfaces 43. A spacer 44 havingan opening 45 conforming to the asymmetric shape of the portion 38 ofpin 17 has a hexagonal shaped outer surface engaged within a hexagonalshaped indentation 46 in outer ferrule 20. The spacer 44 may not berotated relative to ferrule 20 or pin 17.

A compression spring 47 encircles the asymmetric portion 38 of pin 17forcing spacer 44 into indentation 46. The spring 47 is compressed bymeans of a washer 48 and a nut 50 in threaded engagement with anoutboard end of pin 17. The nut 50 may be held relative to pin 17 by anyone of a number of known means, such as, a cotter pin 52.

In assembling the brake rigging 10, the pin 17 is located within opening33. The hexagonal shaped nut 34 is threaded onto one end of the pin 17and then located within the hexagonal shaped indentation 36 in outerferrule 22. The spacer 44 is then slid over the asymmetric portion 38 ofpin 17 into the hexagonal shaped opening 46 in outer ferrule 20. Thespring 47 is next located around the asymmetric portion 38 and thewasher 48 is located on the outer end of pin 17. Nut 50 may thereafterbe threaded on the outer end of pin 17 and secured in place by cotterpin 52 in a known manner. It should be appreciated that in attachinghexagonal shaped nut 34 onto one end of pin 17 a wrench may be used tohold on to flat sides 40 and 42 of asymmetrical portion 38. A secondwrench may, in a known manner, be used to grasp the outer surface ofhexagonal nut 34 to tighten nut 34 and pin 17 relative to each other.

If desired, nut 34 may be located within indentation 36 and the pin 17may be threaded into the nut by means of a wrench on asymmetric portion38. The nut 34 will be held from turning by the walls of indentation 36.

The spring 47 provides a degree of flexibility to the assembly 10. Nut34 may move axially relative to spacer 44 without disengaging eitherpart from their respective openings 36 and 46 and permitting theirrotation relative to one another.

FIG. 4 illustrates another embodiment of the invention, wherein thefernile 22 is pressed into the brake hanger 16. The pin 17 is threadedinto the ferrule 22 in a known manner. This threading may beaccomplished by locating a wrench on asymmetric portion 38 and turningpin 17 relative to ferrule 22. Once the pin is threaded into ferrule 22the spacer 44 may be located around the asymmetric portion 38 and theassembly of the brake rigging may be completed as previously described.

It should be appreciated that the indentations located in outerfer-rules 22 and of FIGS. 1 and 2 or 20 of FIG. 3, may be located in therespective brake hangers. Further, the location of and the need for theinner ferrules 24 and 26 and the bushings 28, 30 and 32 may be variedaccording to standard mechanical design principles.

What is claimed is:

1. In a brake rigging having a first member located intermediate asecond member and a third member, the members having a cylindricalpassage therethrough, a clamping device comprising: a cylindrical pin insaid passage, an asymmetrical end portion adjacent the second member andprojecting outwardly therefrom, and a threaded end portion adjacent thethird member; threads on the third member in engagement with thethreaded end portion, and means engaged with the asymmetrical endportion and the second member to prevent rotation of the pin relative tothe second member.

2. In a brake rigging having a first member located intermediate asecond member and a third member, the members having a cylindricalpassage therethrough, a clamping device comprising: a cylindrical pin insaid passage, an asymmetrical end portion adjacent the second member andprojecting outwardly therefrom, and a threaded end portion adjacent thethird member; an asymmetrical indentation in the third member; a nutlocated within the asymmetrical indentation in threaded engagement withthe threaded end portion of the pin, the nut having an outerasymmetrical configuration which conforms to the configuration of theasymmetrical indentation such that the nut may not be rotated relativeto the indentation when the nut is located therein; and means engagedwith the asymmetrical end portion of the pin and with the second memberto prevent rotation of the pin relative to the second member.

3. A clamping device according to claim 2, wherein the second member hasan asymmetrical indentation, and the means comprises a spacer having aninterior opening closely conforming to the asymmetrical end portion ofthe pin, and an outer configuration closely conforming to theasymmetrical indentation in the second member, the spacer being engagedwith the asymmetrical end portion of the pin and located within theasymmetrical indentation in the second member.

4. A clamping device according to claim 3, wherein the pin extendsoutwardly beyond the asymmetrical end portion, a spring encircles theasymmetrical end portion of the pin and is engaged at one end with the sacer, and fastening means are secured to the end of t e pin outwardlyfrom the asymmetrical end portion to compress the spring and force thespacer into the asymmetrical indentation in the second member.

1. In a brake rigging having a first member located intermediate asecond member and a third member, the members having a cylindricalpassage therethrough, a clamping device comprising: a cylindrical pin insaid passage, an asymmetrical end portion adjacent the second member andprojecting outwardly therefrom, and a threaded end portion adjacent thethird member; threads on the third member in engagement with thethreaded end portion, and means engaged with the asymmetrical endportion and the second member to prevent rotation of the pin relative tothe second member.
 2. In a brake rigging having a first member locatedintermediate a second member and a third member, the members having acylindrical passage therethrough, a clamping device comprising: acylindrical pin in said passage, an asymmetrical end portion adjacentthe second member and projecting outwardly therefrom, and a threaded endportion adjacent the third member; an asymmetrical indentation in thethird member; a nut located within the asymmetrical indentation inthreaded engagement with the threaded end portion of the pin, the nuthaving an outer asymmetrical configuration which conforms to theconfiguration of the asymmetrical indentation such that the nut may notbe rotated relative to the indentation when the nut is located therein;and means engaged with the asymmetrical end portion of the pin and withthe second member to prevent rotation of the pin relative to the secondmember.
 3. A clamping device according to claim 2, wherein the secondmember has an asymmetrical indentation, and the means comprises a spacerhaving an interior opening closely conforming to the asymmetrical endportion of the pin, and an outer configuration closely conforming to theasymmetrical indentation in the second member, the spacer being engagedwith the asymmetrical end portion of the pin and located within theasymmetrical indentation in the second member.
 4. A clamping deviceaccording to claim 3, wherein the pin extends outwardly beyond theasymmetrical end portion, a spring encircles the asymmetrical endportion of the pin and is engaged at one end with the spacer, andfastening means are secured to the end of the pin outwardly from theasymmetrical end portion to compress the spring and force the spacerinto the asymmetrical indentation in the second member.